Add Yahoo as a preferred source to see more of our stories on Google. It's difficult to consider birds similar enough to humans or dogs to think of them as mammals, though. So, are birds mammals? If ...

Principles of taxonomy -- Formal classification of mammalia -- Review of mammalian classification -- Bibliography -- Index to technical names -- Index to vernacular names siris_sil_16894 ...

This article was originally featured on Undark. For centuries, taxonomists have cataloged every living thing they could find. Expeditions have traveled the globe, searching for unknown species; ...

No, birds are not mammals. Rather, they are avians. Mammals are characterized by their milk glands, hair, vertebrae and their birthing of live young (being viviparous), according to Britannica.